148 PROCEEDINGS OF THE ACADEMY OF [March, 
This form, which for the present we subordinate to the old S. laby- 
rinthica, is the only Strobilops except S. hubbardi which I have seen 
from Texas. It may be distinguished from S. virgo by the costulate 
base, wider umbilicus and far weaker inner parietal lamella. S. 
strebeli is a much more depressed cone. 
The statement by Woodward,’ copied into American works, that 
H. labyrinthica occurs in pretertiary European strata, is misleading, 
since the American species is really not identical with any from Euro- 
pean strata, though there are numerous allied forms in the European 
tertiaries. The genus became extinct in Europe, but survives in China, 
Helix diodontina Heude being a Strobilops. In America it has not been 
found in the Northwest or Pacific States, but extends south to Mexico, 
the West Indies and Venezuela, and a species apparently belonging to 
the genus has been described from the Galapagos. 
VALLONIID As. 
Vallonia excentrica Sterki. 
Galveston, under boards ina vacant lot. (Pilsbry, December, 1885.) 
Vallonia perspectiva Sterki. 
Texas: Drift débris of Devil’s river, and of Pecos river near the High 
Bridge, Val Verde county. Arizona: Benson, in drift of San Pedro 
river. 
Vallonia gracilicosta Reinh. 
New Mexico: Drift of Pecos river, at Pecos (Cockerell!). 
Vallonia cyclophorella Anc. 
Arizona: Drift of San Pedro river, Benson, Cochise county, a single 
specimen. 
COCHLICOPID. 
Shell oblong, cylindric-oblong or narrowly tapering, smooth and 
glossy, with imperforate axis; aperture ovate or acuminate, thecolumella 
notched below or continuous with the basal lip. Foot without pedal 
grooves. Kidney with direct ureter, of the Basommatophorous type. 
Genitalia with a long appendix on the penis, as in Achatinella and the 
Pupillide. Jaw and radula about as in Pupillide. 
This group has usually been included in the Achatinide or Stenogy- 
ride, but the direct ureter removes it to a group of primitive snails 
represented only by minute species in America, but by the beautiful 
Achatinellide and Partulide in Polynesia. Cecilianella (Cecilioides) 
10 Manual of the Mollusca, p. 286, edit. 2, 1868. 
